n+(n+3)+(n+6)=y

Solution for n+(n+3)+(n+6)=y equation:

Simplifying
n + (n + 3) + (n + 6) = y

Reorder the terms:
n + (3 + n) + (n + 6) = y

Remove parenthesis around (3 + n)
n + 3 + n + (n + 6) = y

Reorder the terms:
n + 3 + n + (6 + n) = y

Remove parenthesis around (6 + n)
n + 3 + n + 6 + n = y

Reorder the terms:
3 + 6 + n + n + n = y

Combine like terms: 3 + 6 = 9
9 + n + n + n = y

Combine like terms: n + n = 2n
9 + 2n + n = y

Combine like terms: 2n + n = 3n
9 + 3n = y

Solving
9 + 3n = y

Solving for variable 'n'.

Move all terms containing n to the left, all other terms to the right.

Add '-9' to each side of the equation.
9 + -9 + 3n = -9 + y

Combine like terms: 9 + -9 = 0
0 + 3n = -9 + y
3n = -9 + y

Divide each side by '3'.
n = -3 + 0.3333333333y

Simplifying
n = -3 + 0.3333333333y